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Practice-Quiz4

Practice-Quiz4 - and no current flows because the switch is...

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Physics 7B Practice Quiz 4 DL Section Number ____________ Name (last, first) ____________________________ Student ID _______________________ I certify by my signature that I will abide by the code of academic conduct of the University of California. Signature No books or notes. Calculators OK. Show all your work below. Answers alone do not receive credit! The diagram at the right shows a circuit with a capacitor and a resistor. Initially the capacitor has charge Q
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Unformatted text preview: , and no current flows because the switch is open. 1. (1.5 pts) When the switch is closed, current begins to flow. The initial current is I . After 10 seconds the current is I o /2. After how many more seconds will the current be I /8 ? 2. When the current is I /2, what is the charge on the capacitor? 3. Draw a graph of the charge on the capacitor as a function of time. charge on capacitor: Q=CV energy in capacitor: U = CV 2 /2 Q(t) t (s)...
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